A pyrethroid is an organic compound similar to the natural pyrethrins produced by the flowers of pyrethrums (Chrysanthemum cinerariaefolium and C. coccineum). Pyrethroids now constitute the majority of commercial household insecticides. In the concentrations used in such products, they may also have insect repellent properties and are generally ha...
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http://en.wikipedia.org/wiki/Pyrethroid
any of several synthetic compounds that are similar to but more persistent than natural pyrethrins.
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https://www.infoplease.com/dictionary/pyrethroid
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